Standardizes mobile navigation headers: Android uses Home’s shared
Flutter blur; iOS uses native soft edges, with graduated material
retained during large-title collapse and the iOS 26 fallback preserved.
Preserves Home’s upward title motion with a soft boundary and keeps the
avatar crop title visible.
Validation: 4,112 Flutter tests and 111 native tests passed after
merging main. Rendered partial-scroll regression verified on the iOS 27
simulator; removing either review fix fails its regression assertion.
The earlier preview was installed on a physical iPhone with the existing
profile.
---------
Signed-off-by: kenny lopez <klopez4212@gmail.com>
Co-authored-by: Terp <5856f6900e8e0a4e0ea1f4f8d2ee33e4753d2119bc122f94ecafc660b46c0511@buzz.block.builderlab.xyz>
## Summary
Use native iOS sheets for channel editing and Add Members, with profile
avatars, matching search, and destructive removal dialogs. Canvas
content becomes a tappable preview with Add/Remove actions.
Fix the Settings availability menu and clipped copy confirmation. Align
channel action messages with chat styling and keep agent identities
distinguishable across selection, attribution, and profile surfaces.
### Related issue
No duplicate found in the existing mobile Settings/channel issues and
PRs.
### Testing
- Flutter analysis, formatting, file-size checks, focused collision
regressions, and the full mobile test suite passed.
- Production UIKit picker simulator check passed: distinct
visible/accessibility labels, avatar updates, selected rows, and pubkey
callbacks. Wired into Mobile Swift CI.
- Original UI was built and tested on the physical iPhone with author
confirmation; profile/community data preserved.
- Review fixes await renewed author device confirmation before restoring
`buzz-review-completed` and ready-for-review status.
---------
Signed-off-by: kenny lopez <klopez4212@gmail.com>
